American Indian artifacts

I found these on an excursion into my own property. If I didn't have several Indian artifacts books, I wouldn't have thought anything about them. Pictures #1 and #2 show an artifact that was used for sharpening. Picture #3 was a rock that was used to sharpen an arrow tip. Picture #4 is a "pestle" from the pictures that I found. It's an unusual shape and I'll post another picture from another angle.